The patent's assignee for patent number 8655878 is
News editors obtained the following quote from the background information supplied by the inventors: "Media applications which include video and audio database management, database browsing and identification are undergoing explosive growth and are expected to continue to grow. To address this growth, there is a need for a comprehensive solution related to the problem of creating a multimedia sequence database and identifying, within such a database, a particular multimedia sequence or sequences that are tolerant of media content distortions. Multiple applications include video database mining, copyright content detection for video hosting web-sites, contextual advertising placement, and broadcast monitoring of video programming and advertisements.
"Multimedia fingerprinting refers to the ability to generate associated identifying data, referred to as a fingerprint, from the multimedia image, audio and video content. A fingerprint ideally has several properties. First, the fingerprint should be much smaller than the original data. Second, the fingerprint should be designed such that it can be searched for in a large database of fingerprints. Third, the original multimedia content should not be able to be reconstructed from the fingerprint. Fourth, for multimedia content that is a distorted version of another multimedia content, fingerprints of the original and distorted versions should be similar. Examples of some common multimedia distortions include, selecting a clip of video content temporally, cropping the image data, re-encoding the image or audio data to a lower bit rate, changing a frame rate of the video or audio content, re-recording the multimedia data via some analog medium such as a camcorder in a movie theatre, and changing the aspect ratio of the image content. A fingerprint with the fourth property is deemed to be robust against such distortions. Such a system of fingerprinting and search is preferable to other methods of content identification. For example, multimedia watermarking changes the multimedia content by inserting watermark data. Unlike multimedia watermarking, fingerprinting does not change the content.
"Fingerprinting is a very challenging problem. So also developing a scalable system that can easily be managed, changed, replicated is a challenging system problem.
"Increasing demand for such fingerprinting and search solutions, which include standard definition (SD) and high definition (HD) formats of video, three dimensional (3D) videos, virtual reality media content, requires increasing sophistication, flexibility, and performance in the supporting algorithms and hardware. The sophistication, flexibility, and performance that are desired exceed the capabilities of current generations of software based solutions, in many cases, by an order of magnitude."
As a supplement to the background information on this patent, VerticalNews correspondents also obtained the inventors' summary information for this patent: "In one or more of its several aspects, the present invention recognizes and addresses problems such as those described above. To such ends, an embodiment of the invention addresses a method for creating a distributed reference multimedia database. A reference multimedia database is split into a first identifiable portion and a second identifiable portion. The first identifiable portion is stored at a first search server and the second identifiable portion is stored at a second search server. A first query is assigned to the first search server based on the first identifiable portion stored therein and a second query is assigned to the second search server based on the second identifiable portion stored therein. The first query is searched for at the first search server in parallel with the second query searched for at the second search server to find a first content stored in the first identifiable portion and a second content stored in the second identifiable portion that have a close match to the associated first query and to the associated second query.
"Another embodiment of the invention addresses a method for creating a tiered multimedia reference database. A reference multimedia database is split into a first identifiable portion having multimedia content representing the most sought content and a second identifiable portion representing the remaining content. The first identifiable portion is stored at a first search server and the second identifiable portion is stored at a second search server coupled to the first search server. A first query is assigned to the first search server. The first query is searched for at the second search server if a search for the first query at the first search server is not successful to find multimedia content stored in the first search server.
"Another embodiment of the invention addresses a method of tracking units of multimedia content. Reference signatures retrieved from a remote search server for currently displayed units of multimedia content are stored in a client device. Matches in query results are detected for succeeding displayed units of multimedia content using a track search approach to track current displayed units of multimedia content. Display of succeeding units of multimedia content are blocked upon a no match indication detected in the query results.
"Another embodiment of the invention addresses a method for query caching. Signatures of a video sequence are generated at a client. A cache key is generated from the signatures at the client. A search of a remote reference database is requested using the cache key. The remote reference database is searched for a match with the cache key. Results linked with a matching cache key are sent to the client, wherein the results were generated from a previous full search of the reference database.
"A further embodiment of the invention addresses a method of signature database organization by a cluster index. A first set of first signature records for units of multimedia content are stored in a cluster index data structure, wherein the first signature records are grouped by a cluster key. A second set of second signature records for units of multimedia content are stored in a multimedia signature index data structure, wherein the second signature records are grouped by a multimedia identification. Signatures are shared in the single server search system between the cluster index data structure and multimedia signature index data structure.
"These and other features, aspects, techniques and advantages of the present invention will be apparent to those skilled in the art from the following detailed description, taken together with the accompanying drawings and claims."
For additional information on this patent, see: Kulkarni,
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